8662021 has 2 divisors, whose sum is σ = 8662022. Its totient is φ = 8662020.

The previous prime is 8662019. The next prime is 8662037. The reversal of 8662021 is 1202668.

8662021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5239521 + 3422500 = 2289^2 + 1850^2 .

It is a cyclic number.

It is not a de Polignac number, because 8662021 - 2¹ = 8662019 is a prime.

Together with 8662019, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8662091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4331010 + 4331011.

It is an arithmetic number, because the mean of its divisors is an integer number (4331011).

Almost surely, 2^8662021 is an apocalyptic number.

It is an amenable number.

8662021 is a deficient number, since it is larger than the sum of its proper divisors (1).

8662021 is an equidigital number, since it uses as much as digits as its factorization.

8662021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 8662021 is about 2943.1311557591. The cubic root of 8662021 is about 205.3712961681.

Adding to 8662021 its reverse (1202668), we get a palindrome (9864689).

The spelling of 8662021 in words is "eight million, six hundred sixty-two thousand, twenty-one".